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<p class="purpose">Veneer code for use by the Inform 6 compiler with the Z-machine target.</p>

<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1.  </b>These functions have strange-looking names special to the Inform 6 compiler,
which uses them to replace its default "veneer" functions. If we're compiling
to something other than Inform 6, though, they are just strangely-named functions,
and do no harm.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">[ </span><span class="identifier-syntax">Unsigned__Compare</span><span class="plain-syntax"> </span><span class="identifier-syntax">x</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> </span><span class="identifier-syntax">u</span><span class="plain-syntax"> </span><span class="identifier-syntax">v</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">je</span><span class="plain-syntax"> </span><span class="identifier-syntax">x</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> ?</span><span class="reserved-syntax">rfalse</span><span class="plain-syntax">; </span><span class="comment-syntax">i.e., return 0</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">jl</span><span class="plain-syntax"> </span><span class="identifier-syntax">x</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax"> ?</span><span class="identifier-syntax">XNegative</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="comment-syntax">So here x &gt;= 0 and x ~= y</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">jl</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax"> ?</span><span class="identifier-syntax">XPosYNeg</span><span class="plain-syntax">;</span>

<span class="plain-syntax">    </span><span class="comment-syntax">Here x &gt;=0, y &gt;= 0, x ~= y</span>

<span class="plain-syntax">    @</span><span class="identifier-syntax">jg</span><span class="plain-syntax"> </span><span class="identifier-syntax">x</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> ?</span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">; </span><span class="comment-syntax">i.e., return 1</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">ret</span><span class="plain-syntax"> -1;</span>

<span class="plain-syntax">    .</span><span class="identifier-syntax">XPosYNeg</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="comment-syntax">Here x &gt;= 0, y &lt; 0, x ~= y</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">ret</span><span class="plain-syntax"> -1;</span>

<span class="plain-syntax">    .</span><span class="identifier-syntax">XNegative</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">jl</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax"> ?~</span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">; </span><span class="comment-syntax">if x &lt; 0, y &gt;= 0, return 1</span>

<span class="plain-syntax">    </span><span class="comment-syntax">Here x &lt; 0, y &lt; 0, x ~= y</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">jg</span><span class="plain-syntax"> </span><span class="identifier-syntax">x</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> ?</span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">ret</span><span class="plain-syntax"> -1;</span>
<span class="plain-syntax">];</span>

<span class="plain-syntax">[ </span><span class="identifier-syntax">RT__ChLDW</span><span class="plain-syntax"> </span><span class="identifier-syntax">base</span><span class="plain-syntax"> </span><span class="identifier-syntax">offset</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">loadw</span><span class="plain-syntax"> </span><span class="identifier-syntax">base</span><span class="plain-syntax"> </span><span class="identifier-syntax">offset</span><span class="plain-syntax"> -&gt; </span><span class="identifier-syntax">sp</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    @</span><span class="identifier-syntax">ret</span><span class="plain-syntax"> </span><span class="identifier-syntax">sp</span><span class="plain-syntax">;</span>
<span class="plain-syntax">];</span>
</pre>
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